Clinical Features

The classic presentation for SAH is of a sudden-onset severe headache. Headache is present in up to 97% of patients and is commonly associated with nausea and vomiting (77%) or nuchal rigidity (up to 50%). Many studies have reported a seasonal variation in SAH. The incidence of SAH in both men and women is lowest in the summer. The peak season for women suffering SAH is winter, whilst those for men are autumn and spring.

Consciousness is frequently altered, with confusion and lethargy in 30%, transient loss of consciousness in one-third and coma in 17%.

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